Issue #3601197 by beunerd: Fix TypeError in ConfigSorter::sortDeep() when...

Matt Biewenerrequested to merge
issue/config_split-3601197:3601197-typeerror-in-configsortersortdeep into 2.0.x

Issue #3601197 by beunerd: Fix TypeError in ConfigSorter::sortDeep() when active storage read() returns FALSE

Closes #3601197

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